JPH09322372A - Spacer for longitudinal snaking of phase separating arrangement - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the spacer for longitudinal snaking of the power cable in phase separating arrangement, which is inexpensive and has the excellent attaching workability. SOLUTION: As a spacer when a power cable 1 undergoes longitudinal snaking in phase separating arrangement, the spacer, which is made of synthetic resin such as sort PVC, polyethylene and chloroprene rubber and has the cylindrical cross-sectional shape, is used. Furthermore, as a spacer when the power cable undergoes longitudinal snaking in phase separating arrangement, the spacer, which is made or synthetic resin such as soft PVC and polyethylene chloroprene rubber and has the hollow triangular shape, in which the cross-sectional shape is in tight contact with the outer surface of the power cable, can be used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power cable spacer, particularly a power cable spacer that is laid in a cave or the like and is also vertically snaked.

[0002]

2. Description of the Related Art As a spacer used for laying a conventional power cable in a phase-separated manner and a vertical snake, a cross-sectional shape is shown in FIGS. 8 (A) and 8 (B). A spacer 10 coated with an elastic chloroprene rubber 6 is used in a portion of the surface of the hollow triangular aluminum extruded material 5 in contact with the power cable 1. As shown in the side view of FIG. 9 showing a laying example, for example, the spacers 10 are inserted at intervals of 1 m between the three-phase, three-way electric power cables 1 arranged in a bales-like shape to separate phases. The upper part is tied up with a binding cord 9 made of a plastic rope, and the spacer is used as a part to be placed on the receiving object 8 attached to the upright object 7 provided at intervals of about 4 to 6 m in the cave. Position the inserted portion of 10 and fix it with the binding cord 9 or the fixing cleat,
It is laid while maintaining the snake shape over the entire length.

The conventional spacer 10 described above mainly uses aluminum because it is necessary to use a non-magnetic material as its material. In order to process this aluminum material into the spacer 10 shown in FIGS. 8 (A) and 8 (B), a method of pouring into a mold or a method of manufacturing by extrusion can be considered, but at present, the aluminum mold material 5 extruded has a width of about 100 mm. It is used after being cut into pieces and coated with chloroprene rubber 6 on the surface.

[0004]

The manufacturing method of the spacer 10 described above requires three steps, namely, the steps of extruding and cutting an aluminum material, and processing the rubber coating, and it takes time and labor. It was very expensive because it required money.

Further, when the spacer 10 is mounted between the electric power cables 1, the spacer 10 moves, so that it requires a great deal of manpower and labor to arrange and fix the spacer 10 at regular intervals. The sex was very bad. Furthermore, the performance may be unstable because the spacer may move due to movement or vibration due to thermal expansion and contraction of the power cable.

[0006]

The present invention has been made in view of the above points, and an object thereof is to provide a spacer having the actions and effects listed below. In order to significantly reduce the price of the spacer, synthetic resin is used as the material, and it is continuously extruded into a cylindrical or triangular columnar shape. It can be easily installed by cutting it on site according to the pitch of the vertical snake of the spacer (from cleat for fixing cables to cleats) and inserting it between power cables. The spacer can be cut at the factory,
Similar to the power cable, winding the power cable, pulling in the power cable, and extending and inserting the spacer can further reduce the transportation cost of the spacer and the transportation cost in the cave. The spacer material is not limited to soft PVC, polyethylene, chloroprene rubber, and any material can be used as long as it is a synthetic resin that can be extruded. However, depending on the elasticity and mechanical strength of the synthetic resin, the wall thickness at the time of extrusion is changed, and whether to make a hollow cylindrical shape or a solid cylindrical shape is appropriately selected according to the electric power cable to be laid. It is possible to

[0007]

The present invention uses a spacer made of synthetic resin such as soft PVC, polyethylene, or chloroprene rubber and having a cylindrical cross section as a spacer when the power cable is installed in a phase-separated vertical snake. It is a spacer for vertical snakes arranged in a phase-separated manner. In addition, as a spacer when the power cable is installed in a phase-separated vertical snake, use is made of a synthetic resin such as soft PVC, polyethylene, or chloroprene rubber, and a hollow triangular spacer whose cross-sectional shape is in close contact with the outer periphery of the power cable. It is a spacer for vertical snakes with a phase separation arrangement, which is a feature. When extrusion is performed, it is extruded into a hollow cylindrical shape, and when three electric power cables are piled up, the elasticity of the spacer is used to adhere to the outer periphery of the electric power cable. It is a spacer for vertically spaced snakes, which is characterized by having a hollow triangular shape.

Further, according to the present invention, as a spacer for laying the power cable in a phase-separated vertical snake, a synthetic resin such as soft PVC, polyethylene, or chloroprene rubber is used, and its cross-sectional shape is a solid triangular shape that is in close contact with the outer periphery of the power cable. It is a spacer for longitudinally spaced snakes, which is characterized by using the spacer of the above. Also, at the time of extrusion molding, it is extruded into a solid cylindrical shape, and the power cable is
A spacer for vertically spaced snakes, which has a function of closely adhering to the outer periphery of a power cable by utilizing the elasticity of the spacer when it is overlapped with each other to form a triangular shape.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a spacer according to an embodiment. That is, a synthetic resin hollow cylindrical spacer 2 made of soft PVC, polyethylene, chloroprene rubber or the like is spread over the entire length in the center of the power cable 1 laid out in a three-phase three-bale stacked manner. The laying is done.

FIG. 2 is a cross sectional view showing the structure of a spacer of another embodiment. That is, at the time of manufacture, a synthetic resin made of soft PVC, polyethylene, chloroprene rubber or the like is extruded into a hollow triangular cross section at the center of the electric power cable 1 laid out in a three-phase, three-bale stacked manner. The spacers 3 are installed over the entire length. In addition, at the time of manufacturing, a synthetic resin made of soft PVC, polyethylene, chloroprene rubber or the like is extruded into a cylindrical shape in cross section, and when the three electric power cables 1 are stacked, the elasticity of the spacers causes the outer circumference to be in close contact with the outer circumference of the power cable 1 to be a circle. The spacer 3'which is deformed into a hollow triangular shape is arranged over the entire length for installation.

Further, as shown in the cross sectional view of FIG.
At the center of the electric power cable 1 which is laid out in the form of a stack of books and spaced apart from each other, a spacer 4 extruded in a triangular shape with a full section of synthetic resin made of soft PVC, polyethylene, chloroprene rubber or the like is manufactured. Are laid and laid across. In addition, at the time of manufacturing, the cross-section is extruded into a cylindrical shape with a synthetic resin such as soft PVC, polyethylene, or chloroprene rubber. The spacers 4 ′ having a circular shape and deforming into a solid triangle are arranged for installation.

Next, these spacers 2, 3, 3 ',
A laying example using 4 and 4'will be described. FIG. 4 shows an example of installation using the spacer 2 having a cylindrical cross section shown in FIG. That is, the three-phase three-way electric power cable 1 has the conventional spacers 10 inserted into the snake pitch at intervals of the uprights 7 arranged at intervals of 4 to 6 m in the cave, and between the conventional spacers 10. A hollow cylindrical spacer 2 is inserted over the entire length, and the spacers 2 are laid together by being wrapped with a plastic rope 9 at intervals of 1 m, for example. Then, the portion of the standing metal 7 placed on the metal receiver 8 is fixed by binding with a plastic rope 9 or by using a fixing cleat. Therefore, the method of bundling the power cable 1 at regular intervals with the binding cord 9 made of plastic rope is the same as the conventional method, but unlike the conventional method, it is not necessary to bind it at each position where the spacer is inserted, and the installation work is just that much easier. become. In addition, since the spacer is inserted over the entire length, it does not move in the longitudinal direction, and the entire length of the power cable can be held in equilateral triangles separated from each other. And since it is a hollow spacer 2, it is also possible to insert an optical fiber into it, and it is possible to install a power cable and an optical communication cable at the same time, and insert a temperature sensor using an optical fiber for temperature monitoring. It is also possible to use.

Next, a laying example in which the hollow triangular spacer 3 shown in FIG. 2 is inserted in the center of the three-phase three-way power cable 1 will be described with reference to FIG. That is, the hollow triangular spacer 3 is inserted and laid over the entire length in the center of the three-phase three-line power cable 1. Also in this example, the ropes are bundled at a constant interval with a binding cord 9 made of a plastic rope, placed on the receiving object 8 on the uprights 7 arranged at intervals of 4 to 6 m in the cave, and laid in a snake shape. The part is tied with a binding cord 9 made of a plastic rope or fixed with a fixing cleat. At this time, when the fixing cleat is used for fixing instead of binding with the binding cord 9 and fixing, the spacer 3 needs to be cut once at a portion where the fixing cleat is used, such as a bent portion of the power cable 1. . In addition, when the spacer is extruded into a cylindrical shape with synthetic resin and inserted between the power cables 1,
The same applies to the case of laying the spacer 3'which is deformed into a hollow triangular spacer as shown in FIG.

Next, a description will be given of a laying example in which the spacer 4 having a solid triangular shape shown in FIG. 3 is inserted. Also in this case, it is exactly the same as the laying example in which the hollow triangular spacer 3 shown in FIG. 5 is inserted. That is, a spacer 3 having a solid triangular shape is inserted and laid over the entire length in the center of the three-phase three-way power cable 1. In this example as well, the plastic rope 9 is used to bind the portion of the rope 8 bound by the plastic rope 9 at regular intervals and placed on the metal receiver 8 on the uprights 7 arranged at intervals of 4 to 6 m in the cave. Secure by tying and fixing, or by fixing cleat. However, also in this case, it is necessary to cut the spacer 4 once at the portion where the fixing cleat is used, such as the bent portion of the power cable 1. Further, when the spacer is extruded into a columnar shape with a synthetic resin and is inserted between the three electric power cables 1, the spacer 4 is transformed into a spacer having a solid triangular cross-sectional shape as shown in FIG. When laying ´
It is done in exactly the same way.

Therefore, in the case of these examples, equilateral triangular phase-separated arrangements can be performed between the power cables 1 over the entire length, and the workability thereof is simpler than that of the example shown in FIG. And in the case of the hollow spacers 3 and 3 ',
It is also possible to insert an optical fiber therein, and it is possible to lay a power cable and an optical communication cable at the same time, and it is also possible to insert a temperature sensor using an optical fiber and use it for temperature monitoring.

Next, a modified example will be described with reference to FIG.
In the hollow-cylindrical spacer 2 shown in FIG. 1, since the contact points with each power cable 1 are linear and small, it may be difficult to hold the three-strand power cable 1 in an equilateral triangle. As a measure against this, an example is used in which a cylindrical sub spacer 11 having a small cross section is inserted around a hollow cylindrical spacer 2 and made of a synthetic resin such as soft PVC, polyethylene, or chloroprene rubber. This may be formed by integrally extruding the hollow cylindrical spacer 2 and the sub spacer 11 together.

FIG. 7 is a transverse sectional view showing another modification. That is, the hollow cylindrical spacer 2 and the solid triangular spacer are overlapped and coated to form the hollow spacer 12 only in the central portion. This is because the solid triangular spacer 4 shown in FIG. 3 may be relatively heavy depending on the distance between the power cables.

[0018]

As described above, according to the spacer for vertically spaced snakes of the present invention, the cost of the spacer itself can be greatly reduced because the material cost is low and the manufacturing process is simple. Further, since the spacers are continuously inserted over one pitch, there is no fear of shifting in the longitudinal direction, the spacers can be easily fixed, and the spacers are stable over the entire length of the power cable. Furthermore, in the conventional one, it was necessary to measure the spacer interval and fix each spacer with a plastic rope, but since the fixation with the plastic rope can be arbitrarily selected, the mounting workability is good. In the embodiment shown in FIGS. 2 and 3, the spacer can be continuously inserted over a plurality of snake pitches, and the attachment can be efficiently performed. Also, the spacer can be pulled in when the power cable is laid, which makes it extremely easy to transport the spacer and carry it into the cave.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a spacer according to an embodiment,

FIG. 2 is a cross-sectional view showing the structure of a spacer according to another embodiment,

FIG. 3 is a cross-sectional view showing the structure of a spacer according to another embodiment,

FIG. 4 is a side view showing an example of laying the spacer shown in FIG.

FIG. 5 is a side view showing an example of laying the spacers shown in FIGS. 2 and 3;

FIG. 6 is a cross-sectional view showing a configuration of a spacer of a modified example,

FIG. 7 is a cross-sectional view showing the structure of a spacer of another modified example,

8A and 8B are a lateral cross-sectional view and a side view showing the structure of a conventional spacer,

9 is a side view showing an example of laying the conventional spacer shown in FIG.

[Explanation of symbols]

 1 Power Cable 2 Hollow Cylindrical Spacer 3 Hollow Triangular Spacer 4 Solid Triangular Spacer 5 Aluminum Extruded Mold Material 6 Chloroprene Rubber 7 Standing Material 8 Receiving Material 9 Plastic Rope (Bundling String) 10 Spacer 11 Sub Spacer 12 Spacer

Claims (5)

[Claims] 1. A spacer having a cylindrical cross section made of a synthetic resin such as soft PVC, polyethylene, or chloroprene rubber is used as a spacer when the power cable is installed in a separated vertical snake. Arrangement Vertical snake spacer. 2. A hollow triangular spacer made of synthetic resin such as soft PVC, polyethylene, or chloroprene rubber and having a cross-sectional shape in close contact with the outer periphery of the power cable is used as the spacer when the power cable is installed in a phase-separated vertical snake. Spacer for vertical snakes that are separated by phase. 3. Extruding into a hollow cylindrical shape at the time of extrusion molding, and when three electric power cables are piled up, it has a function of adhering to the outer periphery of the electric power cable by utilizing the elasticity of the spacer to form a hollow triangular shape. The spacer for the phase-separated arrangement vertical snake according to claim 2, wherein 4. A spacer, which is made of a synthetic resin such as soft PVC, polyethylene, or chloroprene rubber and has a cross-sectional shape that is in close contact with the outer periphery of the power cable, is used as a spacer when the power cable is installed in a phase-separated vertical snake. Spacer for vertical snakes that are separated by phase. 5. The extrusion molding has a function of sticking to the outer periphery of the power cable by utilizing the elasticity of the spacer when the power cable is extruded into a solid columnar shape and three electric power cables are overlapped. The spacer for longitudinally spaced snakes according to claim 4, characterized in that